$icon_theme_def is not parsed correctly when reading the config file. Correcting this problem.

config/conf.pl

@@ -318,7 +318,7 @@ while ( $line = <FILE> ) {
             $ldap_writeable[$sub] = $writeable;
             $ldap_search_tree[$sub] = $search_tree;
             $ldap_starttls[$sub] = $starttls;
-        } elsif ( $options[0] =~ /^(data_dir|attachment_dir|theme_css|org_logo|signout_page)$/ ) {
+        } elsif ( $options[0] =~ /^(data_dir|attachment_dir|theme_css|org_logo|signout_page|icon_theme_def)$/ ) {
             ${ $options[0] } = &change_to_rel_path($options[1]);
         } else {
             ${ $options[0] } = $options[1];